update test to new foreign object classname

Author: timfel

graalpython/com.oracle.graal.python.test/src/tests/test_register_interop_behavior.py

@@ -252,7 +252,7 @@ def test_build_cache_invalidation_after_delete(self):
             self.assertEqual(readerClass.__name__, "Java_java.io.BufferedReader_generated")
 
             __graalpython__.clear_interop_type_registry()
-            self.assertEqual(type(reader).__name__, "foreign")
+            self.assertEqual(type(reader).__name__, "ForeignObject")
 
 
     from java.lang import Object